Exposure meter



Nov. 29, 1927. 1,651,151

G. RAMSEY EXPOSURE METER Filed Oct. 14, 1926 3 Sheets-Sheet l INVENTOR Nov. 29, 1927..

G. RAMSEY EXPOSURE METER Fiied Oct. 14, 192

mvEN'ToR 3 Sheets-Sheet 2 I Nov. 29, 1927. 1,651,151

G. RAMSEY v EXPOSURE METER Filed Oct. 14, 1926 3 Sheets-Sheet 3 INVENTOR Patented Nova WZEX Patented Nov. 29, 1927. Lfihhlgl 5 ing.

dial or "indicator rotates in sucli u (Lil-Cubicle on relative to the scale thereon as to bring F. Elie present invention llliiiiQS to oxposn' e 6 1*. b2, 1!. 8 etc, successively push the meters of the actinic type in which t poi e indicating; point as the dial rotates. The deof the sensitized material utilized for device also provided with an indicflting i'ei'i'nining the photographic enggth oi the 7 scale representing shutter speed and with xii 10 light by exposing :1 small portion ol's ch ii'mhcntm' adapted to be at any predelnzil'cl'ial ad'zicent a con'ipzzz'utive color lllCiT'i tel-tinned shutter speed 'ndicated on this whereby the length 01" time for full plate seal The setting of the shutter speed con- 7 I' 'n\ I u J! I I ,;f/)(},{,',/ {fie/w'u'uImd/Wulinm'iiiz g' he H1170 huh the lilpldliijf m iotntion oi. the (lh r I i ,U MN, I" H) Hil ill i 7 nncwfszlli' 1 1 1 1 20 (i/JU/N/ H/iM/ H i I i iii may luLv lih inn of n i H uliul'illitlll i -:|n.-|lu "uu l vii. l\s-'n:,iin; lilK HhnIM-r i mi one-lent!) nl' u LUflijllil u of tho (liuplirngin (llill op- 75 H poxitc the indicator (in the face of the inctcl', ggrglplxic plate (YE a pirecletei the onei'utoipushes the st(21i1 0'if the (le ice, a, camera is determined largely My 0 Size tha y exposing :1 portion 01' the sensitized of the diaphragm opening and the ienpgth material opposite a color chart and at the of the exposure, ussun'iing a pi'odetei'i'i'imed 51111116 time, releasing the driving mechanism light condition. in the use oi? an :ictmic which operates to slowly turn the din.- eriposure meter. the time period RECOSSRTY phragm indicating dial. The operator Em: the sensitive inaterizil to ch? to a Watches the exposed actinio surface until it pr i m C 9 to match the c0101 has assumed the same color as the color in index, is h l qa img iKXCtO H111 deX. Then, the stem of the device is pushed ternnned this indicating "factor, and un1- a second t11l16,\Vl11Cl1 stops the driving mechmg; :1 certain shutter speed, the the correct anism. The ope LltOl then observes thenumdiaphragm opening may be easily celcula her on the diai ihrugm dial which stands opzed;

It muhA nu posnre through a camera lens, and ting de vice for determining the rapidity ol movement of said indicator.

in an xposnre meter adapted to e2:- pose a portion of a light ive inatn-ial, the con'ibination of driving mechanism, a diaph 'agin scale, a moving indicator controlled b said driving inechanisn'i and adapted to indicate diapln'a in epeilngs, a shutter ale, and setting device adjacent the shutter i ale lor determining the inpidii}. o't i'novement 0t said indicator.

5. in an exposure meter adapted to expor ion ot ht sensitive material, the combinatirni ol' dri echanisin, a depose a l s-zceinlin scale "elative to :aphragm opening sax -n open n, indicator driven 1 :1 by said mechanism to permit a reacting; to be r'llll on said scale. means: to move the material step by step beneath an exposure opening, and meann to control the speed ol operation oi said driving mechanism.

(3. in an exposure meter adapted to e:- pose a po tion oi light sensitive n aterial, the eonibination of driving mechanism, a diaphragm openin indicator driven b) said mechanis-gm, iiean to control the speed oi operation of said driving inrchanisn, and means under the control ot tin operator to start and stop said driving met,

aianiam.

l. in an exposure meter adapted to l);- pose a portion of light sensitive mat rial, the combination of driving llltxilizlll jl, a diaphragm opening; indicator driven by said mechanism, means to control the speed ot operation 0t said driving i'mx-hanisin, means under thecontrol ot the UllUl'H -JOR to start and atop said driving inechanis'n, and devices to change the position of the light sensitive mat .ial tor each period of operation ol said driving niechanisnn.

in an exposure meter adapted to c."-

pi -:e a portion oi light senaiuve material,

means to carry the sex the comhiiuition oi tive material, light senaitive material carried lrv said inc-a a driving;- mechanism, a dial operated by t driving mechanitan, (,leviccs to start and stop said dial. and means to pone said l1 ll acnf-ntive material when said is started.

El. in an exposure meter adapted to (W pose a portion o light sensitive material, the combination of a casing ha in; an exposure opening, a, rotatable support for the light s live mate ial mounted beneath said opening, light :10! live material carried by said support, a driving mechanism, a rotatable indicaii'ir driven by aid driving mechanism, means to start and stop the rotation of said indicator, and devices to move said support to bring a fresh portion of said sensitive material beneath said exposure opening when Said indi :ator starts to rotate.

ll). in an exposure meter adapted to pose a portion ot l1 ht sensitive material, the combination of a caning having an exposure epenin therein, a support for the light sen- SliLiY, material, a rotatable indicator tor in (heating a tacto of plate exposure "through a camera lens, a driving mechanism comprising a pallet and a balance wheel coopei ding therewith and n'ieans" to cans-5e a rela the movement between said pallet and said ba nce wheel to control the speed of opera on oi? the driving lUOffllZlIllf-li'l in accord ance with another iactor oi? plate exposure through a cam era ens.

ll. in an llipi meter adapted to exsensunve material the combiexposure opening, a

, J nism, an indicator driven by said inechai'..s-zm', and mean; to start and stop the nioveniei'it ot s-aid indicator and to move the said support one step when the movement- (it the indicator is started in an exposure meter adapted for we with a light sensitive material, a casing hav ing an enposnre opening herein, means to support a ring 0t light sensitive material, a o't it sensitive material carried by aid support, means to :ause the sup iort to advance the said ring step by step beneath the exposure opening: a driving mechnisnx, i1 indicator driven by said moi-hato cooperate with a seal 'l ai-lor oi plate ex-- onnh a camera lcna, and devices to alert r iiti mechanism to oporale when said support moved one :ep.

l-l. oaure meter i-ompi-is' in; a movable support for nalcrial, sensitivo material mounted on said support, devices to move said support step by step beniath said ixposure opening, a scale compi aim indi on of a factor of plate expoiiure through a camera lens, driving mechanism. an indicator driven by said driving mecha nisin, and mates to start. and to stop said indicator at the will oi the operator to enable a direct reading to be taken upon said scale to determine said factor, said means being operative upon said devices to move said. support step by step.

P iEORGE RAW S4537.

indii-eu ot a llll) I. DINSTMAN Nov. 29, 1927.

WATCHCASE Filed May 4. 1925 M4 awvantoz I awn/1401;; 235% KIM. 7/1/ 

